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Finding the Fourth Proportional to 2,861.68, 3,949.76 and 1,865.20

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Solution

The fourth proportional to 2,861.68, 3,949.76 and 1,865.20 is: 2,574.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,861.68 : 3,949.76 = 1,865.20 : x
  2. Step 2: Convert to fraction form
    2,861.68/3,949.76 = 1,865.20/x
  3. Step 3: Cross multiply
    2,861.68x = 3,949.76 × 1,865.20
  4. Step 4: Simplify right side
    2,861.68x = 7,367,092.35
  5. Step 5: Solve for x
    x = 7,367,092.35/2,861.68
  6. Step 6: Final answer
    x = 2,574.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.